How to calculate if a dot lies on a line
Posted on 2006-04-11
What is the formula to find out if a third dot lies between two points?
I have (x,y) coordinates for positions A and B. I want to know if postion C is on
the same line that a and b are on.
I thought to use the formula y = mx + b to find the generic formula for the line for the known points A and B. After that plug in the x,y points for C in the line, and
if the line is still true, then line C is in part of the line. But, I do not know how
to do this mathematically. Any suggestions.
| . B